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1/*
2 * Device driver for the Apple Desktop Bus
3 * and the /dev/adb device on macintoshes.
4 *
5 * Copyright (C) 1996 Paul Mackerras.
6 *
7 * Modified to declare controllers as structures, added
8 * client notification of bus reset and handles PowerBook
9 * sleep, by Benjamin Herrenschmidt.
10 *
11 * To do:
12 *
13 * - /sys/bus/adb to list the devices and infos
14 * - more /dev/adb to allow userland to receive the
15 * flow of auto-polling datas from a given device.
16 * - move bus probe to a kernel thread
17 */
18
19#include <linux/types.h>
20#include <linux/errno.h>
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/module.h>
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/sched.h>
27#include <linux/adb.h>
28#include <linux/cuda.h>
29#include <linux/pmu.h>
30#include <linux/notifier.h>
31#include <linux/wait.h>
32#include <linux/init.h>
33#include <linux/delay.h>
34#include <linux/spinlock.h>
35#include <linux/completion.h>
36#include <linux/device.h>
37#include <linux/kthread.h>
38#include <linux/platform_device.h>
39#include <linux/mutex.h>
40
41#include <asm/uaccess.h>
42#ifdef CONFIG_PPC
43#include <asm/prom.h>
44#include <asm/machdep.h>
45#endif
46
47
48EXPORT_SYMBOL(adb_client_list);
49
50extern struct adb_driver via_macii_driver;
51extern struct adb_driver via_maciisi_driver;
52extern struct adb_driver via_cuda_driver;
53extern struct adb_driver adb_iop_driver;
54extern struct adb_driver via_pmu_driver;
55extern struct adb_driver macio_adb_driver;
56
57static DEFINE_MUTEX(adb_mutex);
58static struct adb_driver *adb_driver_list[] = {
59#ifdef CONFIG_ADB_MACII
60 &via_macii_driver,
61#endif
62#ifdef CONFIG_ADB_MACIISI
63 &via_maciisi_driver,
64#endif
65#ifdef CONFIG_ADB_CUDA
66 &via_cuda_driver,
67#endif
68#ifdef CONFIG_ADB_IOP
69 &adb_iop_driver,
70#endif
71#if defined(CONFIG_ADB_PMU) || defined(CONFIG_ADB_PMU68K)
72 &via_pmu_driver,
73#endif
74#ifdef CONFIG_ADB_MACIO
75 &macio_adb_driver,
76#endif
77 NULL
78};
79
80static struct class *adb_dev_class;
81
82static struct adb_driver *adb_controller;
83BLOCKING_NOTIFIER_HEAD(adb_client_list);
84static int adb_got_sleep;
85static int adb_inited;
86static DEFINE_SEMAPHORE(adb_probe_mutex);
87static int sleepy_trackpad;
88static int autopoll_devs;
89int __adb_probe_sync;
90
91static int adb_scan_bus(void);
92static int do_adb_reset_bus(void);
93static void adbdev_init(void);
94static int try_handler_change(int, int);
95
96static struct adb_handler {
97 void (*handler)(unsigned char *, int, int);
98 int original_address;
99 int handler_id;
100 int busy;
101} adb_handler[16];
102
103/*
104 * The adb_handler_mutex mutex protects all accesses to the original_address
105 * and handler_id fields of adb_handler[i] for all i, and changes to the
106 * handler field.
107 * Accesses to the handler field are protected by the adb_handler_lock
108 * rwlock. It is held across all calls to any handler, so that by the
109 * time adb_unregister returns, we know that the old handler isn't being
110 * called.
111 */
112static DEFINE_MUTEX(adb_handler_mutex);
113static DEFINE_RWLOCK(adb_handler_lock);
114
115#if 0
116static void printADBreply(struct adb_request *req)
117{
118 int i;
119
120 printk("adb reply (%d)", req->reply_len);
121 for(i = 0; i < req->reply_len; i++)
122 printk(" %x", req->reply[i]);
123 printk("\n");
124
125}
126#endif
127
128static int adb_scan_bus(void)
129{
130 int i, highFree=0, noMovement;
131 int devmask = 0;
132 struct adb_request req;
133
134 /* assumes adb_handler[] is all zeroes at this point */
135 for (i = 1; i < 16; i++) {
136 /* see if there is anything at address i */
137 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
138 (i << 4) | 0xf);
139 if (req.reply_len > 1)
140 /* one or more devices at this address */
141 adb_handler[i].original_address = i;
142 else if (i > highFree)
143 highFree = i;
144 }
145
146 /* Note we reset noMovement to 0 each time we move a device */
147 for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) {
148 for (i = 1; i < 16; i++) {
149 if (adb_handler[i].original_address == 0)
150 continue;
151 /*
152 * Send a "talk register 3" command to address i
153 * to provoke a collision if there is more than
154 * one device at this address.
155 */
156 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
157 (i << 4) | 0xf);
158 /*
159 * Move the device(s) which didn't detect a
160 * collision to address `highFree'. Hopefully
161 * this only moves one device.
162 */
163 adb_request(&req, NULL, ADBREQ_SYNC, 3,
164 (i<< 4) | 0xb, (highFree | 0x60), 0xfe);
165 /*
166 * See if anybody actually moved. This is suggested
167 * by HW TechNote 01:
168 *
169 * http://developer.apple.com/technotes/hw/hw_01.html
170 */
171 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
172 (highFree << 4) | 0xf);
173 if (req.reply_len <= 1) continue;
174 /*
175 * Test whether there are any device(s) left
176 * at address i.
177 */
178 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
179 (i << 4) | 0xf);
180 if (req.reply_len > 1) {
181 /*
182 * There are still one or more devices
183 * left at address i. Register the one(s)
184 * we moved to `highFree', and find a new
185 * value for highFree.
186 */
187 adb_handler[highFree].original_address =
188 adb_handler[i].original_address;
189 while (highFree > 0 &&
190 adb_handler[highFree].original_address)
191 highFree--;
192 if (highFree <= 0)
193 break;
194
195 noMovement = 0;
196 }
197 else {
198 /*
199 * No devices left at address i; move the
200 * one(s) we moved to `highFree' back to i.
201 */
202 adb_request(&req, NULL, ADBREQ_SYNC, 3,
203 (highFree << 4) | 0xb,
204 (i | 0x60), 0xfe);
205 }
206 }
207 }
208
209 /* Now fill in the handler_id field of the adb_handler entries. */
210 printk(KERN_DEBUG "adb devices:");
211 for (i = 1; i < 16; i++) {
212 if (adb_handler[i].original_address == 0)
213 continue;
214 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
215 (i << 4) | 0xf);
216 adb_handler[i].handler_id = req.reply[2];
217 printk(" [%d]: %d %x", i, adb_handler[i].original_address,
218 adb_handler[i].handler_id);
219 devmask |= 1 << i;
220 }
221 printk("\n");
222 return devmask;
223}
224
225/*
226 * This kernel task handles ADB probing. It dies once probing is
227 * completed.
228 */
229static int
230adb_probe_task(void *x)
231{
232 printk(KERN_INFO "adb: starting probe task...\n");
233 do_adb_reset_bus();
234 printk(KERN_INFO "adb: finished probe task...\n");
235
236 up(&adb_probe_mutex);
237
238 return 0;
239}
240
241static void
242__adb_probe_task(struct work_struct *bullshit)
243{
244 kthread_run(adb_probe_task, NULL, "kadbprobe");
245}
246
247static DECLARE_WORK(adb_reset_work, __adb_probe_task);
248
249int
250adb_reset_bus(void)
251{
252 if (__adb_probe_sync) {
253 do_adb_reset_bus();
254 return 0;
255 }
256
257 down(&adb_probe_mutex);
258 schedule_work(&adb_reset_work);
259 return 0;
260}
261
262#ifdef CONFIG_PM
263/*
264 * notify clients before sleep
265 */
266static int adb_suspend(struct platform_device *dev, pm_message_t state)
267{
268 adb_got_sleep = 1;
269 /* We need to get a lock on the probe thread */
270 down(&adb_probe_mutex);
271 /* Stop autopoll */
272 if (adb_controller->autopoll)
273 adb_controller->autopoll(0);
274 blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL);
275
276 return 0;
277}
278
279/*
280 * reset bus after sleep
281 */
282static int adb_resume(struct platform_device *dev)
283{
284 adb_got_sleep = 0;
285 up(&adb_probe_mutex);
286 adb_reset_bus();
287
288 return 0;
289}
290#endif /* CONFIG_PM */
291
292static int __init adb_init(void)
293{
294 struct adb_driver *driver;
295 int i;
296
297#ifdef CONFIG_PPC32
298 if (!machine_is(chrp) && !machine_is(powermac))
299 return 0;
300#endif
301#ifdef CONFIG_MAC
302 if (!MACH_IS_MAC)
303 return 0;
304#endif
305
306 /* xmon may do early-init */
307 if (adb_inited)
308 return 0;
309 adb_inited = 1;
310
311 adb_controller = NULL;
312
313 i = 0;
314 while ((driver = adb_driver_list[i++]) != NULL) {
315 if (!driver->probe()) {
316 adb_controller = driver;
317 break;
318 }
319 }
320 if (adb_controller != NULL && adb_controller->init &&
321 adb_controller->init())
322 adb_controller = NULL;
323 if (adb_controller == NULL) {
324 printk(KERN_WARNING "Warning: no ADB interface detected\n");
325 } else {
326#ifdef CONFIG_PPC
327 if (of_machine_is_compatible("AAPL,PowerBook1998") ||
328 of_machine_is_compatible("PowerBook1,1"))
329 sleepy_trackpad = 1;
330#endif /* CONFIG_PPC */
331
332 adbdev_init();
333 adb_reset_bus();
334 }
335 return 0;
336}
337
338device_initcall(adb_init);
339
340static int
341do_adb_reset_bus(void)
342{
343 int ret;
344
345 if (adb_controller == NULL)
346 return -ENXIO;
347
348 if (adb_controller->autopoll)
349 adb_controller->autopoll(0);
350
351 blocking_notifier_call_chain(&adb_client_list,
352 ADB_MSG_PRE_RESET, NULL);
353
354 if (sleepy_trackpad) {
355 /* Let the trackpad settle down */
356 msleep(500);
357 }
358
359 mutex_lock(&adb_handler_mutex);
360 write_lock_irq(&adb_handler_lock);
361 memset(adb_handler, 0, sizeof(adb_handler));
362 write_unlock_irq(&adb_handler_lock);
363
364 /* That one is still a bit synchronous, oh well... */
365 if (adb_controller->reset_bus)
366 ret = adb_controller->reset_bus();
367 else
368 ret = 0;
369
370 if (sleepy_trackpad) {
371 /* Let the trackpad settle down */
372 msleep(1500);
373 }
374
375 if (!ret) {
376 autopoll_devs = adb_scan_bus();
377 if (adb_controller->autopoll)
378 adb_controller->autopoll(autopoll_devs);
379 }
380 mutex_unlock(&adb_handler_mutex);
381
382 blocking_notifier_call_chain(&adb_client_list,
383 ADB_MSG_POST_RESET, NULL);
384
385 return ret;
386}
387
388void
389adb_poll(void)
390{
391 if ((adb_controller == NULL)||(adb_controller->poll == NULL))
392 return;
393 adb_controller->poll();
394}
395
396static void adb_sync_req_done(struct adb_request *req)
397{
398 struct completion *comp = req->arg;
399
400 complete(comp);
401}
402
403int
404adb_request(struct adb_request *req, void (*done)(struct adb_request *),
405 int flags, int nbytes, ...)
406{
407 va_list list;
408 int i;
409 int rc;
410 struct completion comp;
411
412 if ((adb_controller == NULL) || (adb_controller->send_request == NULL))
413 return -ENXIO;
414 if (nbytes < 1)
415 return -EINVAL;
416
417 req->nbytes = nbytes+1;
418 req->done = done;
419 req->reply_expected = flags & ADBREQ_REPLY;
420 req->data[0] = ADB_PACKET;
421 va_start(list, nbytes);
422 for (i = 0; i < nbytes; ++i)
423 req->data[i+1] = va_arg(list, int);
424 va_end(list);
425
426 if (flags & ADBREQ_NOSEND)
427 return 0;
428
429 /* Synchronous requests block using an on-stack completion */
430 if (flags & ADBREQ_SYNC) {
431 WARN_ON(done);
432 req->done = adb_sync_req_done;
433 req->arg = ∁
434 init_completion(&comp);
435 }
436
437 rc = adb_controller->send_request(req, 0);
438
439 if ((flags & ADBREQ_SYNC) && !rc && !req->complete)
440 wait_for_completion(&comp);
441
442 return rc;
443}
444
445 /* Ultimately this should return the number of devices with
446 the given default id.
447 And it does it now ! Note: changed behaviour: This function
448 will now register if default_id _and_ handler_id both match
449 but handler_id can be left to 0 to match with default_id only.
450 When handler_id is set, this function will try to adjust
451 the handler_id id it doesn't match. */
452int
453adb_register(int default_id, int handler_id, struct adb_ids *ids,
454 void (*handler)(unsigned char *, int, int))
455{
456 int i;
457
458 mutex_lock(&adb_handler_mutex);
459 ids->nids = 0;
460 for (i = 1; i < 16; i++) {
461 if ((adb_handler[i].original_address == default_id) &&
462 (!handler_id || (handler_id == adb_handler[i].handler_id) ||
463 try_handler_change(i, handler_id))) {
464 if (adb_handler[i].handler != 0) {
465 printk(KERN_ERR
466 "Two handlers for ADB device %d\n",
467 default_id);
468 continue;
469 }
470 write_lock_irq(&adb_handler_lock);
471 adb_handler[i].handler = handler;
472 write_unlock_irq(&adb_handler_lock);
473 ids->id[ids->nids++] = i;
474 }
475 }
476 mutex_unlock(&adb_handler_mutex);
477 return ids->nids;
478}
479
480int
481adb_unregister(int index)
482{
483 int ret = -ENODEV;
484
485 mutex_lock(&adb_handler_mutex);
486 write_lock_irq(&adb_handler_lock);
487 if (adb_handler[index].handler) {
488 while(adb_handler[index].busy) {
489 write_unlock_irq(&adb_handler_lock);
490 yield();
491 write_lock_irq(&adb_handler_lock);
492 }
493 ret = 0;
494 adb_handler[index].handler = NULL;
495 }
496 write_unlock_irq(&adb_handler_lock);
497 mutex_unlock(&adb_handler_mutex);
498 return ret;
499}
500
501void
502adb_input(unsigned char *buf, int nb, int autopoll)
503{
504 int i, id;
505 static int dump_adb_input = 0;
506 unsigned long flags;
507
508 void (*handler)(unsigned char *, int, int);
509
510 /* We skip keystrokes and mouse moves when the sleep process
511 * has been started. We stop autopoll, but this is another security
512 */
513 if (adb_got_sleep)
514 return;
515
516 id = buf[0] >> 4;
517 if (dump_adb_input) {
518 printk(KERN_INFO "adb packet: ");
519 for (i = 0; i < nb; ++i)
520 printk(" %x", buf[i]);
521 printk(", id = %d\n", id);
522 }
523 write_lock_irqsave(&adb_handler_lock, flags);
524 handler = adb_handler[id].handler;
525 if (handler != NULL)
526 adb_handler[id].busy = 1;
527 write_unlock_irqrestore(&adb_handler_lock, flags);
528 if (handler != NULL) {
529 (*handler)(buf, nb, autopoll);
530 wmb();
531 adb_handler[id].busy = 0;
532 }
533
534}
535
536/* Try to change handler to new_id. Will return 1 if successful. */
537static int try_handler_change(int address, int new_id)
538{
539 struct adb_request req;
540
541 if (adb_handler[address].handler_id == new_id)
542 return 1;
543 adb_request(&req, NULL, ADBREQ_SYNC, 3,
544 ADB_WRITEREG(address, 3), address | 0x20, new_id);
545 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
546 ADB_READREG(address, 3));
547 if (req.reply_len < 2)
548 return 0;
549 if (req.reply[2] != new_id)
550 return 0;
551 adb_handler[address].handler_id = req.reply[2];
552
553 return 1;
554}
555
556int
557adb_try_handler_change(int address, int new_id)
558{
559 int ret;
560
561 mutex_lock(&adb_handler_mutex);
562 ret = try_handler_change(address, new_id);
563 mutex_unlock(&adb_handler_mutex);
564 return ret;
565}
566
567int
568adb_get_infos(int address, int *original_address, int *handler_id)
569{
570 mutex_lock(&adb_handler_mutex);
571 *original_address = adb_handler[address].original_address;
572 *handler_id = adb_handler[address].handler_id;
573 mutex_unlock(&adb_handler_mutex);
574
575 return (*original_address != 0);
576}
577
578
579/*
580 * /dev/adb device driver.
581 */
582
583#define ADB_MAJOR 56 /* major number for /dev/adb */
584
585struct adbdev_state {
586 spinlock_t lock;
587 atomic_t n_pending;
588 struct adb_request *completed;
589 wait_queue_head_t wait_queue;
590 int inuse;
591};
592
593static void adb_write_done(struct adb_request *req)
594{
595 struct adbdev_state *state = (struct adbdev_state *) req->arg;
596 unsigned long flags;
597
598 if (!req->complete) {
599 req->reply_len = 0;
600 req->complete = 1;
601 }
602 spin_lock_irqsave(&state->lock, flags);
603 atomic_dec(&state->n_pending);
604 if (!state->inuse) {
605 kfree(req);
606 if (atomic_read(&state->n_pending) == 0) {
607 spin_unlock_irqrestore(&state->lock, flags);
608 kfree(state);
609 return;
610 }
611 } else {
612 struct adb_request **ap = &state->completed;
613 while (*ap != NULL)
614 ap = &(*ap)->next;
615 req->next = NULL;
616 *ap = req;
617 wake_up_interruptible(&state->wait_queue);
618 }
619 spin_unlock_irqrestore(&state->lock, flags);
620}
621
622static int
623do_adb_query(struct adb_request *req)
624{
625 int ret = -EINVAL;
626
627 switch(req->data[1])
628 {
629 case ADB_QUERY_GETDEVINFO:
630 if (req->nbytes < 3)
631 break;
632 mutex_lock(&adb_handler_mutex);
633 req->reply[0] = adb_handler[req->data[2]].original_address;
634 req->reply[1] = adb_handler[req->data[2]].handler_id;
635 mutex_unlock(&adb_handler_mutex);
636 req->complete = 1;
637 req->reply_len = 2;
638 adb_write_done(req);
639 ret = 0;
640 break;
641 }
642 return ret;
643}
644
645static int adb_open(struct inode *inode, struct file *file)
646{
647 struct adbdev_state *state;
648 int ret = 0;
649
650 mutex_lock(&adb_mutex);
651 if (iminor(inode) > 0 || adb_controller == NULL) {
652 ret = -ENXIO;
653 goto out;
654 }
655 state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
656 if (state == 0) {
657 ret = -ENOMEM;
658 goto out;
659 }
660 file->private_data = state;
661 spin_lock_init(&state->lock);
662 atomic_set(&state->n_pending, 0);
663 state->completed = NULL;
664 init_waitqueue_head(&state->wait_queue);
665 state->inuse = 1;
666
667out:
668 mutex_unlock(&adb_mutex);
669 return ret;
670}
671
672static int adb_release(struct inode *inode, struct file *file)
673{
674 struct adbdev_state *state = file->private_data;
675 unsigned long flags;
676
677 mutex_lock(&adb_mutex);
678 if (state) {
679 file->private_data = NULL;
680 spin_lock_irqsave(&state->lock, flags);
681 if (atomic_read(&state->n_pending) == 0
682 && state->completed == NULL) {
683 spin_unlock_irqrestore(&state->lock, flags);
684 kfree(state);
685 } else {
686 state->inuse = 0;
687 spin_unlock_irqrestore(&state->lock, flags);
688 }
689 }
690 mutex_unlock(&adb_mutex);
691 return 0;
692}
693
694static ssize_t adb_read(struct file *file, char __user *buf,
695 size_t count, loff_t *ppos)
696{
697 int ret = 0;
698 struct adbdev_state *state = file->private_data;
699 struct adb_request *req;
700 wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current);
701 unsigned long flags;
702
703 if (count < 2)
704 return -EINVAL;
705 if (count > sizeof(req->reply))
706 count = sizeof(req->reply);
707 if (!access_ok(VERIFY_WRITE, buf, count))
708 return -EFAULT;
709
710 req = NULL;
711 spin_lock_irqsave(&state->lock, flags);
712 add_wait_queue(&state->wait_queue, &wait);
713 current->state = TASK_INTERRUPTIBLE;
714
715 for (;;) {
716 req = state->completed;
717 if (req != NULL)
718 state->completed = req->next;
719 else if (atomic_read(&state->n_pending) == 0)
720 ret = -EIO;
721 if (req != NULL || ret != 0)
722 break;
723
724 if (file->f_flags & O_NONBLOCK) {
725 ret = -EAGAIN;
726 break;
727 }
728 if (signal_pending(current)) {
729 ret = -ERESTARTSYS;
730 break;
731 }
732 spin_unlock_irqrestore(&state->lock, flags);
733 schedule();
734 spin_lock_irqsave(&state->lock, flags);
735 }
736
737 current->state = TASK_RUNNING;
738 remove_wait_queue(&state->wait_queue, &wait);
739 spin_unlock_irqrestore(&state->lock, flags);
740
741 if (ret)
742 return ret;
743
744 ret = req->reply_len;
745 if (ret > count)
746 ret = count;
747 if (ret > 0 && copy_to_user(buf, req->reply, ret))
748 ret = -EFAULT;
749
750 kfree(req);
751 return ret;
752}
753
754static ssize_t adb_write(struct file *file, const char __user *buf,
755 size_t count, loff_t *ppos)
756{
757 int ret/*, i*/;
758 struct adbdev_state *state = file->private_data;
759 struct adb_request *req;
760
761 if (count < 2 || count > sizeof(req->data))
762 return -EINVAL;
763 if (adb_controller == NULL)
764 return -ENXIO;
765 if (!access_ok(VERIFY_READ, buf, count))
766 return -EFAULT;
767
768 req = kmalloc(sizeof(struct adb_request),
769 GFP_KERNEL);
770 if (req == NULL)
771 return -ENOMEM;
772
773 req->nbytes = count;
774 req->done = adb_write_done;
775 req->arg = (void *) state;
776 req->complete = 0;
777
778 ret = -EFAULT;
779 if (copy_from_user(req->data, buf, count))
780 goto out;
781
782 atomic_inc(&state->n_pending);
783
784 /* If a probe is in progress or we are sleeping, wait for it to complete */
785 down(&adb_probe_mutex);
786
787 /* Queries are special requests sent to the ADB driver itself */
788 if (req->data[0] == ADB_QUERY) {
789 if (count > 1)
790 ret = do_adb_query(req);
791 else
792 ret = -EINVAL;
793 up(&adb_probe_mutex);
794 }
795 /* Special case for ADB_BUSRESET request, all others are sent to
796 the controller */
797 else if ((req->data[0] == ADB_PACKET)&&(count > 1)
798 &&(req->data[1] == ADB_BUSRESET)) {
799 ret = do_adb_reset_bus();
800 up(&adb_probe_mutex);
801 atomic_dec(&state->n_pending);
802 if (ret == 0)
803 ret = count;
804 goto out;
805 } else {
806 req->reply_expected = ((req->data[1] & 0xc) == 0xc);
807 if (adb_controller && adb_controller->send_request)
808 ret = adb_controller->send_request(req, 0);
809 else
810 ret = -ENXIO;
811 up(&adb_probe_mutex);
812 }
813
814 if (ret != 0) {
815 atomic_dec(&state->n_pending);
816 goto out;
817 }
818 return count;
819
820out:
821 kfree(req);
822 return ret;
823}
824
825static const struct file_operations adb_fops = {
826 .owner = THIS_MODULE,
827 .llseek = no_llseek,
828 .read = adb_read,
829 .write = adb_write,
830 .open = adb_open,
831 .release = adb_release,
832};
833
834static struct platform_driver adb_pfdrv = {
835 .driver = {
836 .name = "adb",
837 },
838#ifdef CONFIG_PM
839 .suspend = adb_suspend,
840 .resume = adb_resume,
841#endif
842};
843
844static struct platform_device adb_pfdev = {
845 .name = "adb",
846};
847
848static int __init
849adb_dummy_probe(struct platform_device *dev)
850{
851 if (dev == &adb_pfdev)
852 return 0;
853 return -ENODEV;
854}
855
856static void __init
857adbdev_init(void)
858{
859 if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) {
860 printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR);
861 return;
862 }
863
864 adb_dev_class = class_create(THIS_MODULE, "adb");
865 if (IS_ERR(adb_dev_class))
866 return;
867 device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb");
868
869 platform_device_register(&adb_pfdev);
870 platform_driver_probe(&adb_pfdrv, adb_dummy_probe);
871}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Device driver for the Apple Desktop Bus
4 * and the /dev/adb device on macintoshes.
5 *
6 * Copyright (C) 1996 Paul Mackerras.
7 *
8 * Modified to declare controllers as structures, added
9 * client notification of bus reset and handles PowerBook
10 * sleep, by Benjamin Herrenschmidt.
11 *
12 * To do:
13 *
14 * - /sys/bus/adb to list the devices and infos
15 * - more /dev/adb to allow userland to receive the
16 * flow of auto-polling datas from a given device.
17 * - move bus probe to a kernel thread
18 */
19
20#include <linux/types.h>
21#include <linux/errno.h>
22#include <linux/kernel.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/fs.h>
26#include <linux/mm.h>
27#include <linux/sched/signal.h>
28#include <linux/adb.h>
29#include <linux/cuda.h>
30#include <linux/pmu.h>
31#include <linux/notifier.h>
32#include <linux/wait.h>
33#include <linux/init.h>
34#include <linux/delay.h>
35#include <linux/spinlock.h>
36#include <linux/completion.h>
37#include <linux/device.h>
38#include <linux/kthread.h>
39#include <linux/platform_device.h>
40#include <linux/mutex.h>
41
42#include <linux/uaccess.h>
43#ifdef CONFIG_PPC
44#include <asm/prom.h>
45#include <asm/machdep.h>
46#endif
47
48
49EXPORT_SYMBOL(adb_client_list);
50
51extern struct adb_driver via_macii_driver;
52extern struct adb_driver via_cuda_driver;
53extern struct adb_driver adb_iop_driver;
54extern struct adb_driver via_pmu_driver;
55extern struct adb_driver macio_adb_driver;
56
57static DEFINE_MUTEX(adb_mutex);
58static struct adb_driver *adb_driver_list[] = {
59#ifdef CONFIG_ADB_MACII
60 &via_macii_driver,
61#endif
62#ifdef CONFIG_ADB_CUDA
63 &via_cuda_driver,
64#endif
65#ifdef CONFIG_ADB_IOP
66 &adb_iop_driver,
67#endif
68#if defined(CONFIG_ADB_PMU) || defined(CONFIG_ADB_PMU68K)
69 &via_pmu_driver,
70#endif
71#ifdef CONFIG_ADB_MACIO
72 &macio_adb_driver,
73#endif
74 NULL
75};
76
77static struct class *adb_dev_class;
78
79static struct adb_driver *adb_controller;
80BLOCKING_NOTIFIER_HEAD(adb_client_list);
81static int adb_got_sleep;
82static int adb_inited;
83static DEFINE_SEMAPHORE(adb_probe_mutex);
84static int sleepy_trackpad;
85static int autopoll_devs;
86int __adb_probe_sync;
87
88static int adb_scan_bus(void);
89static int do_adb_reset_bus(void);
90static void adbdev_init(void);
91static int try_handler_change(int, int);
92
93static struct adb_handler {
94 void (*handler)(unsigned char *, int, int);
95 int original_address;
96 int handler_id;
97 int busy;
98} adb_handler[16];
99
100/*
101 * The adb_handler_mutex mutex protects all accesses to the original_address
102 * and handler_id fields of adb_handler[i] for all i, and changes to the
103 * handler field.
104 * Accesses to the handler field are protected by the adb_handler_lock
105 * rwlock. It is held across all calls to any handler, so that by the
106 * time adb_unregister returns, we know that the old handler isn't being
107 * called.
108 */
109static DEFINE_MUTEX(adb_handler_mutex);
110static DEFINE_RWLOCK(adb_handler_lock);
111
112#if 0
113static void printADBreply(struct adb_request *req)
114{
115 int i;
116
117 printk("adb reply (%d)", req->reply_len);
118 for(i = 0; i < req->reply_len; i++)
119 printk(" %x", req->reply[i]);
120 printk("\n");
121
122}
123#endif
124
125static int adb_scan_bus(void)
126{
127 int i, highFree=0, noMovement;
128 int devmask = 0;
129 struct adb_request req;
130
131 /* assumes adb_handler[] is all zeroes at this point */
132 for (i = 1; i < 16; i++) {
133 /* see if there is anything at address i */
134 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
135 (i << 4) | 0xf);
136 if (req.reply_len > 1)
137 /* one or more devices at this address */
138 adb_handler[i].original_address = i;
139 else if (i > highFree)
140 highFree = i;
141 }
142
143 /* Note we reset noMovement to 0 each time we move a device */
144 for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) {
145 for (i = 1; i < 16; i++) {
146 if (adb_handler[i].original_address == 0)
147 continue;
148 /*
149 * Send a "talk register 3" command to address i
150 * to provoke a collision if there is more than
151 * one device at this address.
152 */
153 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
154 (i << 4) | 0xf);
155 /*
156 * Move the device(s) which didn't detect a
157 * collision to address `highFree'. Hopefully
158 * this only moves one device.
159 */
160 adb_request(&req, NULL, ADBREQ_SYNC, 3,
161 (i<< 4) | 0xb, (highFree | 0x60), 0xfe);
162 /*
163 * See if anybody actually moved. This is suggested
164 * by HW TechNote 01:
165 *
166 * http://developer.apple.com/technotes/hw/hw_01.html
167 */
168 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
169 (highFree << 4) | 0xf);
170 if (req.reply_len <= 1) continue;
171 /*
172 * Test whether there are any device(s) left
173 * at address i.
174 */
175 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
176 (i << 4) | 0xf);
177 if (req.reply_len > 1) {
178 /*
179 * There are still one or more devices
180 * left at address i. Register the one(s)
181 * we moved to `highFree', and find a new
182 * value for highFree.
183 */
184 adb_handler[highFree].original_address =
185 adb_handler[i].original_address;
186 while (highFree > 0 &&
187 adb_handler[highFree].original_address)
188 highFree--;
189 if (highFree <= 0)
190 break;
191
192 noMovement = 0;
193 } else {
194 /*
195 * No devices left at address i; move the
196 * one(s) we moved to `highFree' back to i.
197 */
198 adb_request(&req, NULL, ADBREQ_SYNC, 3,
199 (highFree << 4) | 0xb,
200 (i | 0x60), 0xfe);
201 }
202 }
203 }
204
205 /* Now fill in the handler_id field of the adb_handler entries. */
206 pr_debug("adb devices:\n");
207 for (i = 1; i < 16; i++) {
208 if (adb_handler[i].original_address == 0)
209 continue;
210 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
211 (i << 4) | 0xf);
212 adb_handler[i].handler_id = req.reply[2];
213 pr_debug(" [%d]: %d %x\n", i, adb_handler[i].original_address,
214 adb_handler[i].handler_id);
215 devmask |= 1 << i;
216 }
217 return devmask;
218}
219
220/*
221 * This kernel task handles ADB probing. It dies once probing is
222 * completed.
223 */
224static int
225adb_probe_task(void *x)
226{
227 pr_debug("adb: starting probe task...\n");
228 do_adb_reset_bus();
229 pr_debug("adb: finished probe task...\n");
230
231 up(&adb_probe_mutex);
232
233 return 0;
234}
235
236static void
237__adb_probe_task(struct work_struct *bullshit)
238{
239 kthread_run(adb_probe_task, NULL, "kadbprobe");
240}
241
242static DECLARE_WORK(adb_reset_work, __adb_probe_task);
243
244int
245adb_reset_bus(void)
246{
247 if (__adb_probe_sync) {
248 do_adb_reset_bus();
249 return 0;
250 }
251
252 down(&adb_probe_mutex);
253 schedule_work(&adb_reset_work);
254 return 0;
255}
256
257#ifdef CONFIG_PM
258/*
259 * notify clients before sleep
260 */
261static int __adb_suspend(struct platform_device *dev, pm_message_t state)
262{
263 adb_got_sleep = 1;
264 /* We need to get a lock on the probe thread */
265 down(&adb_probe_mutex);
266 /* Stop autopoll */
267 if (adb_controller->autopoll)
268 adb_controller->autopoll(0);
269 blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL);
270
271 return 0;
272}
273
274static int adb_suspend(struct device *dev)
275{
276 return __adb_suspend(to_platform_device(dev), PMSG_SUSPEND);
277}
278
279static int adb_freeze(struct device *dev)
280{
281 return __adb_suspend(to_platform_device(dev), PMSG_FREEZE);
282}
283
284static int adb_poweroff(struct device *dev)
285{
286 return __adb_suspend(to_platform_device(dev), PMSG_HIBERNATE);
287}
288
289/*
290 * reset bus after sleep
291 */
292static int __adb_resume(struct platform_device *dev)
293{
294 adb_got_sleep = 0;
295 up(&adb_probe_mutex);
296 adb_reset_bus();
297
298 return 0;
299}
300
301static int adb_resume(struct device *dev)
302{
303 return __adb_resume(to_platform_device(dev));
304}
305#endif /* CONFIG_PM */
306
307static int __init adb_init(void)
308{
309 struct adb_driver *driver;
310 int i;
311
312#ifdef CONFIG_PPC32
313 if (!machine_is(chrp) && !machine_is(powermac))
314 return 0;
315#endif
316#ifdef CONFIG_MAC
317 if (!MACH_IS_MAC)
318 return 0;
319#endif
320
321 /* xmon may do early-init */
322 if (adb_inited)
323 return 0;
324 adb_inited = 1;
325
326 adb_controller = NULL;
327
328 i = 0;
329 while ((driver = adb_driver_list[i++]) != NULL) {
330 if (!driver->probe()) {
331 adb_controller = driver;
332 break;
333 }
334 }
335 if (adb_controller != NULL && adb_controller->init &&
336 adb_controller->init())
337 adb_controller = NULL;
338 if (adb_controller == NULL) {
339 pr_warn("Warning: no ADB interface detected\n");
340 } else {
341#ifdef CONFIG_PPC
342 if (of_machine_is_compatible("AAPL,PowerBook1998") ||
343 of_machine_is_compatible("PowerBook1,1"))
344 sleepy_trackpad = 1;
345#endif /* CONFIG_PPC */
346
347 adbdev_init();
348 adb_reset_bus();
349 }
350 return 0;
351}
352
353device_initcall(adb_init);
354
355static int
356do_adb_reset_bus(void)
357{
358 int ret;
359
360 if (adb_controller == NULL)
361 return -ENXIO;
362
363 if (adb_controller->autopoll)
364 adb_controller->autopoll(0);
365
366 blocking_notifier_call_chain(&adb_client_list,
367 ADB_MSG_PRE_RESET, NULL);
368
369 if (sleepy_trackpad) {
370 /* Let the trackpad settle down */
371 msleep(500);
372 }
373
374 mutex_lock(&adb_handler_mutex);
375 write_lock_irq(&adb_handler_lock);
376 memset(adb_handler, 0, sizeof(adb_handler));
377 write_unlock_irq(&adb_handler_lock);
378
379 /* That one is still a bit synchronous, oh well... */
380 if (adb_controller->reset_bus)
381 ret = adb_controller->reset_bus();
382 else
383 ret = 0;
384
385 if (sleepy_trackpad) {
386 /* Let the trackpad settle down */
387 msleep(1500);
388 }
389
390 if (!ret) {
391 autopoll_devs = adb_scan_bus();
392 if (adb_controller->autopoll)
393 adb_controller->autopoll(autopoll_devs);
394 }
395 mutex_unlock(&adb_handler_mutex);
396
397 blocking_notifier_call_chain(&adb_client_list,
398 ADB_MSG_POST_RESET, NULL);
399
400 return ret;
401}
402
403void
404adb_poll(void)
405{
406 if ((adb_controller == NULL)||(adb_controller->poll == NULL))
407 return;
408 adb_controller->poll();
409}
410EXPORT_SYMBOL(adb_poll);
411
412static void adb_sync_req_done(struct adb_request *req)
413{
414 struct completion *comp = req->arg;
415
416 complete(comp);
417}
418
419int
420adb_request(struct adb_request *req, void (*done)(struct adb_request *),
421 int flags, int nbytes, ...)
422{
423 va_list list;
424 int i;
425 int rc;
426 struct completion comp;
427
428 if ((adb_controller == NULL) || (adb_controller->send_request == NULL))
429 return -ENXIO;
430 if (nbytes < 1)
431 return -EINVAL;
432
433 req->nbytes = nbytes+1;
434 req->done = done;
435 req->reply_expected = flags & ADBREQ_REPLY;
436 req->data[0] = ADB_PACKET;
437 va_start(list, nbytes);
438 for (i = 0; i < nbytes; ++i)
439 req->data[i+1] = va_arg(list, int);
440 va_end(list);
441
442 if (flags & ADBREQ_NOSEND)
443 return 0;
444
445 /* Synchronous requests block using an on-stack completion */
446 if (flags & ADBREQ_SYNC) {
447 WARN_ON(done);
448 req->done = adb_sync_req_done;
449 req->arg = ∁
450 init_completion(&comp);
451 }
452
453 rc = adb_controller->send_request(req, 0);
454
455 if ((flags & ADBREQ_SYNC) && !rc && !req->complete)
456 wait_for_completion(&comp);
457
458 return rc;
459}
460EXPORT_SYMBOL(adb_request);
461
462 /* Ultimately this should return the number of devices with
463 the given default id.
464 And it does it now ! Note: changed behaviour: This function
465 will now register if default_id _and_ handler_id both match
466 but handler_id can be left to 0 to match with default_id only.
467 When handler_id is set, this function will try to adjust
468 the handler_id id it doesn't match. */
469int
470adb_register(int default_id, int handler_id, struct adb_ids *ids,
471 void (*handler)(unsigned char *, int, int))
472{
473 int i;
474
475 mutex_lock(&adb_handler_mutex);
476 ids->nids = 0;
477 for (i = 1; i < 16; i++) {
478 if ((adb_handler[i].original_address == default_id) &&
479 (!handler_id || (handler_id == adb_handler[i].handler_id) ||
480 try_handler_change(i, handler_id))) {
481 if (adb_handler[i].handler != 0) {
482 pr_err("Two handlers for ADB device %d\n",
483 default_id);
484 continue;
485 }
486 write_lock_irq(&adb_handler_lock);
487 adb_handler[i].handler = handler;
488 write_unlock_irq(&adb_handler_lock);
489 ids->id[ids->nids++] = i;
490 }
491 }
492 mutex_unlock(&adb_handler_mutex);
493 return ids->nids;
494}
495EXPORT_SYMBOL(adb_register);
496
497int
498adb_unregister(int index)
499{
500 int ret = -ENODEV;
501
502 mutex_lock(&adb_handler_mutex);
503 write_lock_irq(&adb_handler_lock);
504 if (adb_handler[index].handler) {
505 while(adb_handler[index].busy) {
506 write_unlock_irq(&adb_handler_lock);
507 yield();
508 write_lock_irq(&adb_handler_lock);
509 }
510 ret = 0;
511 adb_handler[index].handler = NULL;
512 }
513 write_unlock_irq(&adb_handler_lock);
514 mutex_unlock(&adb_handler_mutex);
515 return ret;
516}
517EXPORT_SYMBOL(adb_unregister);
518
519void
520adb_input(unsigned char *buf, int nb, int autopoll)
521{
522 int i, id;
523 static int dump_adb_input;
524 unsigned long flags;
525
526 void (*handler)(unsigned char *, int, int);
527
528 /* We skip keystrokes and mouse moves when the sleep process
529 * has been started. We stop autopoll, but this is another security
530 */
531 if (adb_got_sleep)
532 return;
533
534 id = buf[0] >> 4;
535 if (dump_adb_input) {
536 pr_info("adb packet: ");
537 for (i = 0; i < nb; ++i)
538 pr_cont(" %x", buf[i]);
539 pr_cont(", id = %d\n", id);
540 }
541 write_lock_irqsave(&adb_handler_lock, flags);
542 handler = adb_handler[id].handler;
543 if (handler != NULL)
544 adb_handler[id].busy = 1;
545 write_unlock_irqrestore(&adb_handler_lock, flags);
546 if (handler != NULL) {
547 (*handler)(buf, nb, autopoll);
548 wmb();
549 adb_handler[id].busy = 0;
550 }
551
552}
553
554/* Try to change handler to new_id. Will return 1 if successful. */
555static int try_handler_change(int address, int new_id)
556{
557 struct adb_request req;
558
559 if (adb_handler[address].handler_id == new_id)
560 return 1;
561 adb_request(&req, NULL, ADBREQ_SYNC, 3,
562 ADB_WRITEREG(address, 3), address | 0x20, new_id);
563 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
564 ADB_READREG(address, 3));
565 if (req.reply_len < 2)
566 return 0;
567 if (req.reply[2] != new_id)
568 return 0;
569 adb_handler[address].handler_id = req.reply[2];
570
571 return 1;
572}
573
574int
575adb_try_handler_change(int address, int new_id)
576{
577 int ret;
578
579 mutex_lock(&adb_handler_mutex);
580 ret = try_handler_change(address, new_id);
581 mutex_unlock(&adb_handler_mutex);
582 return ret;
583}
584EXPORT_SYMBOL(adb_try_handler_change);
585
586int
587adb_get_infos(int address, int *original_address, int *handler_id)
588{
589 mutex_lock(&adb_handler_mutex);
590 *original_address = adb_handler[address].original_address;
591 *handler_id = adb_handler[address].handler_id;
592 mutex_unlock(&adb_handler_mutex);
593
594 return (*original_address != 0);
595}
596
597
598/*
599 * /dev/adb device driver.
600 */
601
602#define ADB_MAJOR 56 /* major number for /dev/adb */
603
604struct adbdev_state {
605 spinlock_t lock;
606 atomic_t n_pending;
607 struct adb_request *completed;
608 wait_queue_head_t wait_queue;
609 int inuse;
610};
611
612static void adb_write_done(struct adb_request *req)
613{
614 struct adbdev_state *state = (struct adbdev_state *) req->arg;
615 unsigned long flags;
616
617 if (!req->complete) {
618 req->reply_len = 0;
619 req->complete = 1;
620 }
621 spin_lock_irqsave(&state->lock, flags);
622 atomic_dec(&state->n_pending);
623 if (!state->inuse) {
624 kfree(req);
625 if (atomic_read(&state->n_pending) == 0) {
626 spin_unlock_irqrestore(&state->lock, flags);
627 kfree(state);
628 return;
629 }
630 } else {
631 struct adb_request **ap = &state->completed;
632 while (*ap != NULL)
633 ap = &(*ap)->next;
634 req->next = NULL;
635 *ap = req;
636 wake_up_interruptible(&state->wait_queue);
637 }
638 spin_unlock_irqrestore(&state->lock, flags);
639}
640
641static int
642do_adb_query(struct adb_request *req)
643{
644 int ret = -EINVAL;
645
646 switch(req->data[1]) {
647 case ADB_QUERY_GETDEVINFO:
648 if (req->nbytes < 3)
649 break;
650 mutex_lock(&adb_handler_mutex);
651 req->reply[0] = adb_handler[req->data[2]].original_address;
652 req->reply[1] = adb_handler[req->data[2]].handler_id;
653 mutex_unlock(&adb_handler_mutex);
654 req->complete = 1;
655 req->reply_len = 2;
656 adb_write_done(req);
657 ret = 0;
658 break;
659 }
660 return ret;
661}
662
663static int adb_open(struct inode *inode, struct file *file)
664{
665 struct adbdev_state *state;
666 int ret = 0;
667
668 mutex_lock(&adb_mutex);
669 if (iminor(inode) > 0 || adb_controller == NULL) {
670 ret = -ENXIO;
671 goto out;
672 }
673 state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
674 if (state == 0) {
675 ret = -ENOMEM;
676 goto out;
677 }
678 file->private_data = state;
679 spin_lock_init(&state->lock);
680 atomic_set(&state->n_pending, 0);
681 state->completed = NULL;
682 init_waitqueue_head(&state->wait_queue);
683 state->inuse = 1;
684
685out:
686 mutex_unlock(&adb_mutex);
687 return ret;
688}
689
690static int adb_release(struct inode *inode, struct file *file)
691{
692 struct adbdev_state *state = file->private_data;
693 unsigned long flags;
694
695 mutex_lock(&adb_mutex);
696 if (state) {
697 file->private_data = NULL;
698 spin_lock_irqsave(&state->lock, flags);
699 if (atomic_read(&state->n_pending) == 0
700 && state->completed == NULL) {
701 spin_unlock_irqrestore(&state->lock, flags);
702 kfree(state);
703 } else {
704 state->inuse = 0;
705 spin_unlock_irqrestore(&state->lock, flags);
706 }
707 }
708 mutex_unlock(&adb_mutex);
709 return 0;
710}
711
712static ssize_t adb_read(struct file *file, char __user *buf,
713 size_t count, loff_t *ppos)
714{
715 int ret = 0;
716 struct adbdev_state *state = file->private_data;
717 struct adb_request *req;
718 DECLARE_WAITQUEUE(wait, current);
719 unsigned long flags;
720
721 if (count < 2)
722 return -EINVAL;
723 if (count > sizeof(req->reply))
724 count = sizeof(req->reply);
725
726 req = NULL;
727 spin_lock_irqsave(&state->lock, flags);
728 add_wait_queue(&state->wait_queue, &wait);
729 set_current_state(TASK_INTERRUPTIBLE);
730
731 for (;;) {
732 req = state->completed;
733 if (req != NULL)
734 state->completed = req->next;
735 else if (atomic_read(&state->n_pending) == 0)
736 ret = -EIO;
737 if (req != NULL || ret != 0)
738 break;
739
740 if (file->f_flags & O_NONBLOCK) {
741 ret = -EAGAIN;
742 break;
743 }
744 if (signal_pending(current)) {
745 ret = -ERESTARTSYS;
746 break;
747 }
748 spin_unlock_irqrestore(&state->lock, flags);
749 schedule();
750 spin_lock_irqsave(&state->lock, flags);
751 }
752
753 set_current_state(TASK_RUNNING);
754 remove_wait_queue(&state->wait_queue, &wait);
755 spin_unlock_irqrestore(&state->lock, flags);
756
757 if (ret)
758 return ret;
759
760 ret = req->reply_len;
761 if (ret > count)
762 ret = count;
763 if (ret > 0 && copy_to_user(buf, req->reply, ret))
764 ret = -EFAULT;
765
766 kfree(req);
767 return ret;
768}
769
770static ssize_t adb_write(struct file *file, const char __user *buf,
771 size_t count, loff_t *ppos)
772{
773 int ret/*, i*/;
774 struct adbdev_state *state = file->private_data;
775 struct adb_request *req;
776
777 if (count < 2 || count > sizeof(req->data))
778 return -EINVAL;
779 if (adb_controller == NULL)
780 return -ENXIO;
781
782 req = kmalloc(sizeof(struct adb_request),
783 GFP_KERNEL);
784 if (req == NULL)
785 return -ENOMEM;
786
787 req->nbytes = count;
788 req->done = adb_write_done;
789 req->arg = (void *) state;
790 req->complete = 0;
791
792 ret = -EFAULT;
793 if (copy_from_user(req->data, buf, count))
794 goto out;
795
796 atomic_inc(&state->n_pending);
797
798 /* If a probe is in progress or we are sleeping, wait for it to complete */
799 down(&adb_probe_mutex);
800
801 /* Queries are special requests sent to the ADB driver itself */
802 if (req->data[0] == ADB_QUERY) {
803 if (count > 1)
804 ret = do_adb_query(req);
805 else
806 ret = -EINVAL;
807 up(&adb_probe_mutex);
808 }
809 /* Special case for ADB_BUSRESET request, all others are sent to
810 the controller */
811 else if ((req->data[0] == ADB_PACKET) && (count > 1)
812 && (req->data[1] == ADB_BUSRESET)) {
813 ret = do_adb_reset_bus();
814 up(&adb_probe_mutex);
815 atomic_dec(&state->n_pending);
816 if (ret == 0)
817 ret = count;
818 goto out;
819 } else {
820 req->reply_expected = ((req->data[1] & 0xc) == 0xc);
821 if (adb_controller && adb_controller->send_request)
822 ret = adb_controller->send_request(req, 0);
823 else
824 ret = -ENXIO;
825 up(&adb_probe_mutex);
826 }
827
828 if (ret != 0) {
829 atomic_dec(&state->n_pending);
830 goto out;
831 }
832 return count;
833
834out:
835 kfree(req);
836 return ret;
837}
838
839static const struct file_operations adb_fops = {
840 .owner = THIS_MODULE,
841 .llseek = no_llseek,
842 .read = adb_read,
843 .write = adb_write,
844 .open = adb_open,
845 .release = adb_release,
846};
847
848#ifdef CONFIG_PM
849static const struct dev_pm_ops adb_dev_pm_ops = {
850 .suspend = adb_suspend,
851 .resume = adb_resume,
852 /* Hibernate hooks */
853 .freeze = adb_freeze,
854 .thaw = adb_resume,
855 .poweroff = adb_poweroff,
856 .restore = adb_resume,
857};
858#endif
859
860static struct platform_driver adb_pfdrv = {
861 .driver = {
862 .name = "adb",
863#ifdef CONFIG_PM
864 .pm = &adb_dev_pm_ops,
865#endif
866 },
867};
868
869static struct platform_device adb_pfdev = {
870 .name = "adb",
871};
872
873static int __init
874adb_dummy_probe(struct platform_device *dev)
875{
876 if (dev == &adb_pfdev)
877 return 0;
878 return -ENODEV;
879}
880
881static void __init
882adbdev_init(void)
883{
884 if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) {
885 pr_err("adb: unable to get major %d\n", ADB_MAJOR);
886 return;
887 }
888
889 adb_dev_class = class_create(THIS_MODULE, "adb");
890 if (IS_ERR(adb_dev_class))
891 return;
892 device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb");
893
894 platform_device_register(&adb_pfdev);
895 platform_driver_probe(&adb_pfdrv, adb_dummy_probe);
896}